bowtye8

Trying to put together a package for my Baja 272 Its a stocker 300hp 7.4l. Not a mag
1. Are the internals decent on this motor?

Been searching. Looking to get another 100-150 hp. Right now top speed is 55mpg. Looking to get 65 but anything over 60 will do
Looking at the edlebrooks 6155-Performer RPM Assembled Heads, 118cc. These are about 1400.00 without springs.

What intake? performance series Edlebrook.
What cam. and finally what decent carb?
Will this achieve my goal?
Will the factory exhaust manifolds suffice. Its does have thru hual.

Thanks
Dennis
http://bowtye8.tzo.com/baja

Vinny P

The internals of that motor are all cast, not the best for upgrades. If interested, I have a 454 Magnum MPI 385 h.p. for sale. That motor pushed my Convincor to 65 gps

KAAMA

If you are looking for a BUDGET/low dollar set of 454's here's something that might interest you. A couple of years ago my cousin had his stock Merc 330's 454's with some very inexpensive upgrade/mods and then had them dyno tested on Earhart's dyno, with flat tappet hyd cams (.515"/.515" lift with 218*/226* duration at .050" on 110* lobes), dual plane intakes, stock Merc Thunderbolt ignition, 8.6 comp ratio, 830 Holley carb, with a turned 10/10 cast crank, 3/8" rods, cast pistons (although I would prefer at least forged pistons), and 2-bolt main blocks, some junk old GM, semi open chambered, oval port heads that he added some 2.19" stainless intake valves and 1.85" exhaust valves to. JimV did the port work, and originally tried using a 1.88" exhaust valve on that particular head, but he said the smaller valve actually flowed better (on the flow bench) than the larger exhaust valve. This is true even with the porting, and valve un-shrouding work the smaller exhaust valve still out-flowed the larger 1.88" valve. He was definately on a BUDGET, but he still had good, accurate machine work done. I call these the "poor mans hi-performance 330's". Or you can get real elaborate with your $$$ if you want as you are making parts choices.

On Earhart's dyno he made 461hp (with dyno headers) @ 5100rpm, and 510 lbs of torque @3600rpm and stayed very flat up to 5000rpm.

He runs the engines in a 1988 32' Baja' with GIL exhaust manifolds, and dry pipes. He was originally turning 3-bladed 21" prop with the stock engines, and with a GPS it is showing he has picked up 10mph at cruising speed of about 3500-4000rpm with a 3-bladed 25" prop with a top speed of 69.7mph @5000rpm with the old Bravo One gear case. He still needs to play with props a bit and he doesn't know what the boat did with the stock Merc 330's as he didn't have a GPS back then, but he said he can feel a BIG difference and is very happy.